CVE-2025-38178

Description

In the Linux kernel, the following vulnerability has been resolved: EDAC/igen6: Fix NULL pointer dereference A kernel panic was reported with the following kernel log: EDAC igen6: Expected 2 mcs, but only 1 detected. BUG: unable to handle page fault for address: 000000000000d570 ... Hardware name: Notebook V54x_6x_TU/V54x_6x_TU, BIOS Dasharo (coreboot+UEFI) v0.9.0 07/17/2024 RIP: e030:ecclog_handler+0x7e/0xf0 [igen6_edac] ... igen6_probe+0x2a0/0x343 [igen6_edac] ... igen6_init+0xc5/0xff0 [igen6_edac] ... This issue occurred because one memory controller was disabled by the BIOS but the igen6_edac driver still checked all the memory controllers, including this absent one, to identify the source of the error. Accessing the null MMIO for the absent memory controller resulted in the oops above. Fix this issue by reverting the configuration structure to non-const and updating the field 'res_cfg->num_imc' to reflect the number of detected memory controllers.

Reserved 2025-04-16 | Published 2025-07-04 | Updated 2025-07-04 | Assigner Linux

Product status

Default status
unaffected

decaed3a7c4159916fb3c58f2c944bbcbfbdde06 before 40e69c93d6dadc5355bfe90f3940c402d171289c
affected

20e190b1c1fd88b21cc5106c12cfe6def5ab849d before 88efa0de3285be66969b71ec137d9dab1ee19e52
affected

Default status
affected

6.16-rc1
affected

Any version before 6.16-rc1
unaffected

6.16-rc3
unaffected

References

git.kernel.org/...c/40e69c93d6dadc5355bfe90f3940c402d171289c

git.kernel.org/...c/88efa0de3285be66969b71ec137d9dab1ee19e52

cve.org (CVE-2025-38178)

nvd.nist.gov (CVE-2025-38178)

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